What's inside this crater in Madagascar?

I rarely post anything, but I checked to see if this one had been shared already as I think it is a truly well made mini documentary likely to interest many here. I'm amazed at the resources that were thrown at this project, as both narration and photography are quite breathtaking.

I'm also glad they didn't end on a moralist note/call to action (e.g. to send funds to alleviate this or that issue that cropped up during their research, like the road situation). It makes the whole thing feel even more genuine, the tale of an unadulterated curiosity that resulted in an epic quest. Thanks Vox